Well you should use a mounting plate BUT you can do it without one..
Make the top,flip the top over and place your Chicago router where you want it to be.. take a pencil and draw around the base, then find some plywood/MDF scrap stock about 24" square or so and do the same thing, once your done take a jig saw and cut out the hole in the scrap stock, this will become your template,,, now chuck up a pattern bit with the bearing on the shank in of the bit,,, set it so the bit will plunge down to 7/16" deep.
Once you have the pocket clean and FLAT ,,take the black plate off the router,, draw a circle in the center and mark the mounting holes,,cut out the center hole and drill out the mounting holes, flip the top over and couter sink the mounting holes,,,then set your router upside down on the work bench and put the new top on it and put the mounting screws in place......
You now have router table..
with the router in place,, you can use a good true 2" x 4" for a fence that you can clamp to the top..
I will apreciate if you can give some ideas for make a router table without buy a insert for the router, I have 3 routers ...Skill, craftsman (1/4") and 1 Chicago (1/2"), I was using a portable Skill router table, but now I would like now some more proffesional.
I have only one year in the woodworking...
tks for your ideas..
jiiim, saltillo, coahuila, mexico